Safety-fuse.



PATENTBD JULY- 16, 1907.

I'. OPRBNDEK.

SAFETY FUSE.

PPLIOATIoN FILED sBPT.12.1so5.

W o e mm2/nr vf g WAI @www UNITED STATES PATENT oEEIoE.

FRANZ OPRENDEK,'OF VIENNA, AUSTRIA-HUNGARY, ASSIGNOR, BY MESNEASSIGNMENTS, OF ONE-HALF TO SAMU POLLAK, OF GYR, AUSTRIA-HUN GARY.

SAFETY-FUSE.

Specification of Letters Patent.

Patented July 16,1907.

fusing material is passed around two contact pins and upon the burningout of the portion of the cord between the contact pins the same isdisplaced by means of an appropriate device in such a manner that afresh and unburned portion of cord comes between the contact pins. Y

The improvement relates particularly to the means for obtaining acertain contact between the safety cord and the contact pins, and alsoto the means by which the portion of cord in reserve is completelyprotected from flames due to short-circuiting.

A safety fuse constructed in accordance with the present invention isillustrated in the accompanying drawing, Vin which:

Figures l and 2 represent a longitudinal section and plan, with thecover removed, and Fig. 3 a cross section on the line A-B of Fig. 2.

The asbestos cord a, which contains a known fusing material such as leadwire, is wound upon tlie bobbin c, and is carried in the known mannerover 'the contact pins d, d, which by means of the terminals o, o,projecting from the casing are connected to the light or .power system.The end i coming off the contact pins d, d is wound around a drawing offbobbin I: arranged at the middle of the box b, and which is adapted tobe rotated by means of a spindle 1n projecting through the.

cover g of the casing and provided with ahead f.

Parallel with the line of connection of the two contact pins d, d aspring plate n, which is well insulated or which is made entirely ofinsulating material, is arranged, the`chek-like reinforcements or ribsx, y"v of which plate are pressed by means of the spring o bearing uponthe wall of the casing, against the contact pins d, d that is to sayagainst the asbestos cord a; by this means a reliable contact betweenthe cord aand the contact pins d, d is obtained under all conditions.

Against the extremity of a pin p which is guided in any convenientmanner (inthe present case in the partition r), the other end of whichpin comes into contact `substantially as described.

with or is attached to the plate n there acts a tappet '0r cam plate qkeyed upon the shaft m; owing to this arrangement, upon the rotation ofthe handle f, which takes place for example for thepurpose of replacinga burned piece of cord, the cam plateq presses back the rod p, by whichmeans the plate n is maintained separatedfrom the contact pins d, d orfrom the asbestos cord a thereon until the length of cordvnecessary forre-v establishing an electrical connection between the contac-t pins d,d,'has been wound off.

In order to smother any flame due to short-circuiting as speedily aspossible and to prevent injury to the length of cord held in reservethat portion of'the casing in which the length of cord carried overthecontact pins moves, is separated from the rest of the casingby apartition r Iin which openings are provided for the passage of theasbestos cord a and which also 'carries the guide sleeve s for the rodp.

The casing b and its cover g are made of porcelain or other insulatingmaterial.

Having now particularly describedrand ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim isz- 1. A safety fuse device comprising'a fuse cordwound upon a storage spool and guided over pins projecting from theterminals'rof an electric circuit, means to unwind from the spool saidcord for bringing fresh parts of it between said pins, an insulatedspring actuated block adapted to press upon the -cordin order to insuregood Contact of its metallicl strands with the pins, means to relievethe spring pressure while the cord is moved forward, and a. partitionseparating the cord on the spool from the piece stretched across thecontact pins substantially as described.

2. A safety fuse device comprising a fuse cord wound upon a storagespool and guided over pins projecting from the terminals of an electriccircuit, a drum with a head for' turning -the same to unwind the cordfrom the storage spool, cams secured to the shaft of the drum with ahead, an insulated spring actuated block adapted to press upon the cordin'ordento insure good contact of its metallic 90 strands with the pins,a r'od bearing against the spring actuated insulated block and adaptedto be longitudinally displaced hy the cams when the shaft is turned bythe head in order to' relieve the spring pressure while the cord ismoved forward, and a partition separating the cord on the spool from thepiece stretched across the. contact pins In testimony whereof I hereuntoalixI my signature in presence of two witnesses.

FRANZ OPRENDEK. I Witnesses:

FRIEDRICH BINNnn, ALvEsTo S. HoGUE.

